OpenEBS Helm Repository

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OpenEBS helps Developers and Platform SREs easily deploy Kubernetes Stateful Workloads that require fast and highly reliable container attached storage. OpenEBS can be deployed on any Kubernetes cluster - either in cloud, on-premise (virtual or bare metal) or developer laptop (minikube).

OpenEBS Data Engines and Control Plane are implemented as micro-services, deployed as containers and orchestrated by Kubernetes itself. An added advantage of being a completely Kubernetes native solution is that administrators and developers can interact and manage OpenEBS using all the wonderful tooling that is available for Kubernetes like kubectl, Helm, Prometheus, Grafana, etc.

OpenEBS turns any storage available on the Kubernetes worker nodes into local or distributed Kubernetes Persistent Volumes.

Local Volumes are accessible only from a single node in the cluster. Pods using Local Volume have to be scheduled on the node where volume is provisioned. Local Volumes are typically preferred for distributed workloads like Cassandra, MongoDB, Elastic, etc that are distributed in nature and have high availability built into them. Depending on the type of storage attached to your Kubernetes worker nodes, you can select from different flavors of Dynamic Local PV - Hostpath, Device, LVM, ZFS or Rawfile.
Replicated Volumes as the name suggests, are those that have their data synchronously replicated to multiple nodes. Volumes can sustain node failures. The replication also can be setup across availability zones helping applications move across availability zones. Depending on the type of storage attached to your Kubernetes worker nodes and application performance requirements, you can select from Jiva, cStor or Mayastor.

Documentation and user guides

You can run OpenEBS on any Kubernetes 1.18+ cluster in a matter of minutes. See the Quickstart Guide to OpenEBS for detailed instructions.

Getting started

How to customize OpenEBS Helm chart?

OpenEBS helm chart is an umbrella chart that pulls together engine specific charts. The engine charts are included as dependencies. arts/openebs/Chart.yaml). OpenEBS helm chart will includes common components that are used by multiple engines like:

Node Disk Manager related components
Dynamic Local Provisioner related components
Security Policies like RBAC, PSP, Kyverno

openebs
├── (default) openebs-ndm
├── (default) localpv-provisioner
├── jiva
├── cstor
├── zfs-localpv
└── lvm-localpv
└── nfs-provisioner

To install the engine charts, the helm install must be provided with a engine enabled flag like cstor.enabled=true or zfs-localpv.enabled=true or by passing a custom values.yaml with required engines enabled.

Prerequisites

Kubernetes 1.18+ with RBAC enabled
When using cstor and jiva engines, iSCSI utils must be installed on all the nodes where stateful pods are going to run.
Depending on the engine and type of platform, you may have to customize the values or run additional pre-requisistes. Refer to documentation.

Setup Helm Repository

Before installing OpenEBS Helm charts, you need to add the OpenEBS Helm repository to your Helm client.

helm repo add openebs https://openebs.github.io/charts
helm repo update

Installing OpenEBS

helm install --name `my-release` --namespace openebs openebs/openebs --create-namespace

Examples:

Assuming the release will be called openebs, the command would be:

helm install --name openebs --namespace openebs openebs/openebs --create-namespace

To install OpenEBS with cStor CSI driver, run

helm install openebs openebs/openebs --namespace openebs --create-namespace --set cstor.enabled=true

To install/enable a new engine on the installed helm release openebs, you can run the helm upgrade command as follows:
```
helm upgrade openebs openebs/openebs --namespace openebs --reuse-values --set jiva.enabled=true 
```

To disable legacy out of tree jiva and cstor provisioners, run the following command.

helm upgrade openebs openebs/openebs --namespace openebs --reuse-values --set legacy.enabled=false 

For more details on customizing and installing OpenEBS please see the chart readme.

To uninstall/delete instance with release name

helm ls --all
helm delete `my-release`

Tip: Prior to deleting the helm chart, make sure all the storage volumes and pools are deleted.